app.py

import gradio as gr
from transformers import AutoTokenizer, AutoModelForCausalLM, BitsAndBytesConfig
import torch
from spaces import GPU

GPU = lambda: GPU(duration=70)

bnb_config = BitsAndBytesConfig(
    load_in_4bit=True,
    bnb_4bit_use_double_quant=True,
    bnb_4bit_quant_type="nf4",
    bnb_4bit_compute_dtype=torch.bfloat16
)

model_id = "cognitivecomputations/dolphin-2.5-mixtral-8x7b"

tokenizer = AutoTokenizer.from_pretrained(model_id)
model = AutoModelForCausalLM.from_pretrained(model_id, quantization_config=bnb_config)

@GPU
def predict(input_text, history):
    chat = []
    for item in history:
        chat.append({"role": "user", "content": item[0]})
        if item[1] is not None:
            chat.append({"role": "assistant", "content": item[1]})
    chat.append({"role": "user", "content": input_text})
    
    conv = tokenizer.apply_chat_template(chat, tokenize=False)
    inputs = tokenizer(conv, return_tensors="pt").to("cuda")
    outputs = model.generate(**inputs, max_new_tokens=2048)
    
    generated_text = tokenizer.batch_decode(outputs, skip_special_tokens=True)[0]
    return generated_text.split("<|assistant|>")[-1]

gr.ChatInterface(predict, theme="soft").launch()